Rounding up to two decimal places

rubyonrails-talk
1

Hi there

I am going to calculate VAT at one of my websites, and UK VAT is 17.5 %. So the question is how to round up some value to two decimal points?

I often get values like 6,991..

In php I was using round function

round($price, 2)

is in ruby something similat to PHP's round function where I could specify number of decimal places ?

P.

2

one way is to use round(n * 100) / 100.0

3

in Ruby, it is like (n * 100).round / 100.0

4

Thanks,

And which part of the code corresponds for the number of decimal places I want to round? (I am sorry sorry for killing you, I am just a small designer.)

5

it is like (n * 10**2).round / (10**2).to_f

the 2 is the one you want and 10**2 is 10 to the power of 2.

6

n would be your number, then multiplying it by 100 and rounding it would round it to 2 decimal places, then divide it by 100 to get your decimal back…

n = 12.3456

n * 100 = 1234.56

round(n) = 1235

1235 / 100 = 12.35

pgega wrote:

7

and as I assume n is my value I want to round ?

8

sorry, line 3 should be n.round()

William Pratt wrote:

9

n = 12.3456 n * 100 = 1234.56 round(n) = 1235 1235 / 100 = 12.35

So clear , so easy. Thanks a lot.